Page 4 - Syok Praktis PBD (2023) Science TH4
P. 4
Science Year 4 Practice 2 Humans
2.3 Response towards Stimuli
1. Stimuli: Changes in the environment.
2. Sensory organs receive stimuli. The table below
shows a summary of the sensory organs and
their functions.
Sensory organs Function
Eyes Sight • Responding towards the traffic lights
(stimuli) tells road users when to move
Ears Hear
and to stop.
Nose Smell
Skin Touch 5. Human response is important:
• to avoid injury
Tongue Taste
• to save oneself
3. Response: The action taken towards the stimuli. • to obtain information and to communicate
4. The following shows several responses and 6. Alcohol, glue and drugs disrupt and delay the
stimuli: human response towards a stimuli.
Drinking alcohol Sniffing glue
• Responding towards the honking of the
car (stimuli) prevents an accident.
Drugs abuse
7. Alcohol causes one to be drunk and can lead
to addiction.
8. Glue sniffing causes hallucinations.
9. Drug abuse can also lead to addiction.
10. In all three situations above, the substances
• Responding towards the bad taste and can lead to a disruption to the body’s ability to
smell of the spoiled milk (stimuli) prevents function normally for as long as the substances
food poisoning. remain in the body.
7 © Penerbitan Pelangi Sdn. Bhd.
Practice 2.indd 7 27/09/2022 1:53 PM
